Improved slide-chuck for lathes



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` CHARLES F. sT'AoKPoLE, or. WoBUnN, MASS.wHUsETiS.A

`, Letters .Patent -No;10.6,42(A) (lated August-16, 1870..

IMPRovnn SLIDE-eimer: Fon Leans.

,IheA Schedule referred to in` these Letters Patent and making part oftIe same tion thereof, which wiiienable others skilled in the art tomake and use the same, reference being had to the accompanying drawingforming part ot' this specification.

. Figure 1- is a face view of' my improved chuck.

Figure 2 is a rear view of the same. Figure 3 is aA detail sectionallview of the same,

jtakentlnpngh-theliue :c x, fig. 1..

- Figure 4 is a detail sectional view of the same,

Ataken through the line y y, iig. 1.

Similar Yletters ofreference indicate corresponding parts.

My invention has for its-object to furnish anims provedslide-chuck forlathes, designed more particuln'ly for holding crank-axles while beingturned, but

equallyapplicable for holding other work, and which shall be simple inconstruction and easily adjusted; and

It consists in the construction and combination of the various parts of'the chuck, as hereinaftermore fullydescrihed. l A is the face-plate ofthe chuck, which is secured in place by screws or bolts inthe ordinai-ymanner, the screw-holes being shown in fig. 2.

The face of t-he plate A basa dovetailed groove formed in fit, as shownin figs. 1 and 3, into which groove is fitted the dcvctailed slide B. v

The slide B is moved longitudinally to adjust it by i the screw C, asshown in figs. 3 and 4. The screw C may be swiveled to the face-plate A,as shown in g. 4, or to the slide B, as may be desired. y

In the tirst case the screw C is stationary', and passes through a nut,D, attached to the slide B, so that the said slide and nut may be moved.by turning thc said screw.

Inthe last case Vthe nut D is attached to the faceplate A, and the screwC travelswith the slide B.

In the slide B, near its ends, are formed two holes, :t

2, provided with set-screws b to hold the crank or a `pin and bushing,E, according to the character of the work to be held.

In the face-plate A are formed two holes', provided' with set-screws a',to receive and hold the studs F, as shown in figs. l and 3.

The studs F'arealso provided with set-screws f to hold the work or thedog, as may-he desired.

In turning crank-axles, another chuck similar to this is necessarilyemployed.

The iirst step in the operation consists in adjusting each slide B sothat its center@ shall be in the center' ot' the disk. The axle'is thencentered at its 'extreme .ends, andrmly. secured bya dog attached to the.chuck of the dead spindle.

When said end has been' turned, the axle is re versed to repeat theoperation on its opposite one.

Each slide B is then readjnsted so as to occupy its original position,with its ends Hush with the periphery of the disk A, as in figs. land 4,and the turned ends ofthe axle inserted in corresporuiing holes in thedisks, care having been previously taken thatl these shallv be of therequisite size, and the set-screws f advjust-ed to. center the wrists ofthe cranks.

After turning 'said wrists. the axle is reversed, as

before, and the operation completed.

Gare the gibs, which are set up by sctl-screws in the ordinary manner,and which may have a scale ot division-marks formed upon them, forconvenienceiir pose set forth. V

' CHARLES F. STACKPOLE.

Witnesses: v

N. J. SIMoNDs, J AMES BUEL.

